it is working perfect on many of my nodes but one node have low battery compared to other nodes. They all have same battery type CR123A, 3 volt battery.
On this node the volt level is 2.4 V. It was not new when I start to use it. It was starting at 2.5V.
Last month it gives noise/jumping measurement. Going from 2.4 down to 1.9 see below. There are no measurements between 2.4 and 1.9.
From start

@Yveaux
I don't know because the battery was old when I started to use it.
Home made pcb. Report every 30 minutes. No cap on battery.
Take a look at this graph. This may be a new battery, don't remember. Has been running since 1/4 2016